Problem #15 from Ch. 9 (p. 269). Hint: for part (a),
just estimate the total mass excavated and compute the energy
required to lift it 10 times the crater diameter. Assume the
acceleration due to gravity over that height remains constant.
You'll need to assume a bulk density for the material. For part
(b), see Fig. 9-6.
Problem #13 from Ch. 10 (p. 315). Hint: use the
expression involving in the mathematical notes on p. 297.
over that height remains constant.
You'll need to assume a bulk density for the material. For part
(b), see Fig. 9-6.
in the mathematical notes on p. 297.